Thanks for the reply. I ordered these parts and fitted them but unfortunately nothing. Got a mate in to wind calipers back to test them again and they seem to be sticky. Sprayed some wd40 behind the gator and worked it in and out several times which seemed to free it up. No doubt only a temp fix though so looking like I'll need to bite the bullet and buy calipers.
Looking on autodoc I've came across a company called Starks, has anyone had any experience with their parts? Around half the price for a caliper and motor with a 3 year warranty... Seems too good to be true.